Shock-absorbing support pad for a snowboard binding equipped with such support pad

ABSTRACT

Shock-absorbing wedge provided to be arranged between a boot and a board, or between the boot and a device for retaining the boot on the board, the board being adapted to snowboarding. The wedge is characterized in that it has at least two layers of materials of a different hardness. A first layer has a support surface provided to make contact with the boot and has a bonding surface opposite to the support surface. A second layer is joined to the bonding surface of the first layer. The hardness of the second layer is less than the hardness of the first layer.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to the field of snowboarding and more particularly to a device for retaining a boot on a gliding board adapted for snowboarding.

[0003] 2. Descrption of Background and Material Information

[0004] The practice of snowboarding is generally done with either rigid shell boots or flexible boots.

[0005] For flexible boots, certain retaining devices have at least one shockabsorbing wedge, generally located between a baseplate of the device and the boot when the latter is retained on the device.

[0006] The wedge is provided to improve the user's comfort and to absorb the impacts or short displacements of the boot with respect to the device.

[0007] It has been observed that certain wedges deteriorate very quickly when the device is used and, as a result, they no longer fuilfil their shock-absorbing role.

[0008] It has also been observed that the wedges that resist a quick deterioration do not absorb the impacts or short displacements enough, and that these wedges do little to improve the user's comfort.

SUMMARY OF THE INVENTION

[0009] An object of the invention is to provide a wedge that improves the user's comfort and absorbs the impacts or short displacements of the boot with respect to the device, while resisting the wear and abrasion caused by the boots.

[0010] Another object of the invention is to provide a retaining device having at least such a wedge.

[0011] A shock-absorbing wedge according to the invention is provided to be arranged between a boot and a board, or between the boot and a device for retaining a boot on the board, the board being adapted to snowboarding.

[0012] The wedge, according to the invention, has at least two layers of materials with a different hardness, a first layer which has a support surface provided to make contact with the boot and which has a bonding surface opposite to the support surface, and a second layer which is joined to the bonding surface from the first layer, the hardness of the second layer being less than the hardness of the first layer. This structure improves the user's comfort and absorbs the impacts or short displacements of the boot due to the second layer. Additionally, this structure offers a good resistance to the wear and abrasion caused by the boots due to the first layer.

[0013] According to a particular feature of the invention, the first layer and the second layer are glued together.

[0014] According to another feature of the invention, the first layer is made from a relatively flexible plastic material with a substantially continuous structure, and the second layer is made from a relatively flexible plastic material with a cell-,type structure.

[0015] In addition to the foregoing, the invention also encompasses a device for retaining a boot on a gliding board adapted to snowboarding, the device comprising at least one shock-absorbing wedge provided to make contact with the boot, wherein the wedge comprises at least two layers of materials of a different hardness, a first layer which has a support surface provided to make contact with the boot and which has a bonding surface opposite to the support surface, and a second layer which is joined to the bonding surface of the first layer, the hardness of the second layer being less than the hardness of the first layer.

[0016] Further according to the invention, the wedge is arranged to contact a baseplate of the device, so that the first layer touches the sole of the boot when the latter is retained on the device.

[0017] Still further according to the invention, the first layer and the second layer are glued together, and the first layer is glued to the baseplate.

[0018] Still further according to the invention, the first layer of the wedge is made from a relatively flexible plastic material with a substantially continuous structure, and the second layer of the wedge is made from a relatively flexible material with a cell-type structure.

BRIEF DFSCRIPTION OF DRAWINGS

[0019] Other characteristics and advantages of the invention will be better understood with the following description with reference to the attached drawings which show, by way of non-limiting examples, how the invention can be obtained, and in which:

[0020]FIG. 1 is a perspective view of a retaining device for a flexible boot, the device having two wedges;

[0021]FIG. 2 is a cross-section taken along the line II-II of FIG. 1 corresponding to a first embodiment; and

[0022]FIG. 3 is similar to FIG. 2 but corresponds to a second embodiment.

DETAILED DESCRIPTION OF THE INVENTION

[0023] A retaining device 1 according to the invention and shown in FIG. 1 is provided to retain, in a known manner, a boot (not shown) on a board 2. The device 1 has a baseplate 3 provided to receive the sole of the boot, as well as a rear support element 4 allowing a rear support by contact with the boot upper at the rear of the lower part of the user's leg. The device 1 is affixed to the board 2 by a disk 5 and by means for retaining the disk 5 onto the board 2.

[0024] A first embodiment of the invention is described with reference to FIG. 2.

[0025] As known, the baseplate 3 has an upper surface 6 facing the sole of the boot when the latter is retained on the device 1, as well as a lower surface 7 opposite to the upper surface 6. The board 2 has a support surface 8 opposite to a gliding surface 9, the surface 8 of the board 2 touching the lower surface 7 of the baseplate 3.

[0026] A shock-absorbing wedge 10 is housed in a closed cavity 1 of the baseplate 3, the cavity 11 having a bottom 12 and a peripheral edge 13. The wedge 10 has a first layer 14 provided to make contact with the sole, as well as a second layer 15 located between the layer 14 and the bottom 12.

[0027] A support surface 16 of the first layer 14 touches the sole of the boot when the latter is retained on the baseplate 3. A bonding surface 17 of the layer 14, opposite to the support surface 16 with respect to the thickness of the layer 14, is joined to the second layer 15.

[0028] Preferably, the bonding between the layers 14 and 15 is obtained by an adhesive, but any other technique could be used.

[0029] The first layer 14 is made from a relatively flexible material which resists well attrition, pulling, cutting, or other mechanical biases. It is preferably obtained from a flexible plastic material having a homogenous and continuous structure, as a polyurethane sheet, a rubber sheet or any suitable material.

[0030] For example, the layer 14 can measure between 1 and 2 mm thick and bends easily between the fingers when manipulated. Its thickness is reduced from 1% to 10% when it is subjected to a compression force which generates a stress between 50 and 100 N/cm².

[0031] The second layer 15 is made from a flexible material which has good elastic deforming and shock-absorbing abilities. The flexible material can be a foam made from a plastic material with a cell-type structure, a rubber foam, or any other suitable material such as a fiber mat.

[0032] For example, the layer 15 can measure between 2 and 10 mm thick and bends easily between the fingers when manipulated. Its thickness is reduced from 30% to 50% when it is subjected to a compression force, which generates a stress between 50 and 100 N/cm².

[0033] In any case, the second layer 15 has greater flexibility than the first layer 14.

[0034] Preferably, the wedge 10 is retained in the cavity I1I by a retaining means constituted here by gluing.

[0035] A second embodiment of the invention is seen in FIG. 3.

[0036] For convenience, the same reference numerals are used to designate the same elements or similar elements.

[0037] The wedge 10 is housed in a through cavity 18 of the baseplate 3 whose opening facing the board 2 is larger than the opening leading to the upper surface 6.

[0038] The first layer 14 is pressed against a peripheral edge 19 of the cavity 18.

[0039] The second layer 15 is arranged between the first layer 14 and the board 2.

[0040] The materials used for implementing the second embodiment are similar to those of the first embodiment.

[0041] The respective shapes of the wedge 10 and the cavity 18 allow maintaining the wedge 10 in the cavity 18.

[0042] However, it is possible to provide a complementary means for affixing such as gluing the wedge 10 to the peripheral edge 19 of the cavity 18 of the baseplate 3.

[0043] Preferably for all embodiments, the support surface 16 of the wedge 10 projects slightly with respect to the upper surface 6 of the baseplate 3. Thus, the contact between the sole and the wedge 10 is preferred with respect to a contact between the sole and the surface 6 of the baseplate 3.

[0044] When the boot takes support on the device 1, the thickness of the wedge 10 is reduced, essentially by compression of the second layer 15. Inversely, when the boot is separated from the device 1, the wedge 10 returns to its original shape due to the elasticity of the constitutive material of the second layer 15.

[0045] As seen in FIG. 1, the baseplate 3 of the device 1 has a crescent-shaped wedge 10 located substantially at the metatarsal bones of the foot, as well as a crescent-shaped wedge 20 located substantially towards the heel of the foot. The shapes of the wedges 10, 20 improve foot stability and comfort during torsional biases of the user's leg.

[0046] The invention is not limited to the embodiments described herein, and includes all technical equivalents within the scope of the following claims.

[0047] In particular, the shapes of the wedges 10, 20 and the thicknesses of their materials can vary to allow selecting specific shock-absorbing values, for example.

[0048] The shapes of the cavities 11, 18 can also vary, and possibly be different from the shapes of the wedges 10, 20.

[0049] The bonding surface 17 of the first layer 14 can be planar as in the first embodiment, curved inward as in the second embodiment, or have any suitable shape.

[0050] Furthermore, each wedge 10, 20 can have additional layers which, in this case, would be located between the second layer 15 and the bottom 12, or between the second layer 15 and the surface 8 of the board 2.

[0051] This application is based upon French Patent Application No. 97 12738, filed October 3, 1997, the disclosure of which is hereby incorporated by reference thereto in its entirety, and the priority of which is hereby claimed under 35 USC 119. 

What is claimed is:
 1. A shock-absorbing wedge provided to be arranged between a boot and a board, or between the boot and a device for retaining a boot on the board, the board being adapted to snowboarding, wherein it comprises at least two layers of materials of a different hardness, a first layer having a support surface provided to make contact with the boot and which has a bonding surface opposite to the support surface, and a second layer which is joined to the bonding surface of the first layer, the hardness of the second layer being less than the hardness of the first layer.
 2. A shock-absorbing wedge according to claim 1 , wherein the first layer and the second layer are glued together.
 3. A shock-absorbing wedge according to claim 1 , wherein the first layer is made from a relatively flexible plastic material with a substantially continuous structure, and the second layer is made from a relatively flexible plastic material with a cell-type structure.
 4. A device for retaining a boot on a gliding board adapted to snowboarding, the device comprising at least one shock-absorbing wedge provided to make contact with the boot, wherein the wedge comprises at least two layers of materials of a different hardness, a first layer which has a support surface provided to make contact with the boot and which has a bonding surface opposite to the support surface, and a second layer which is joined to the bonding surface of the first layer, the hardness of the second layer being less than the hardness of the first layer.
 5. A retaining device according to claim 4 , wherein the wedge is arranged to contact a baseplate of the device, so that the first layer touches the sole of the boot when the latter is retained on the device.
 6. A retaining device according to claim 5 , wherein the first layer and the second layer are glued together, and the first layer is glued to the baseplate.
 7. A retaining device according to claim 4 , wherein the first layer of the wedge is made from a relatively flexible plastic material with a substantially continuous structure, and the second layer of the wedge is made from a relatively flexible material with a cell-type structure. 